∴|x-1|=0;(xy-2)2=0
∴x=1,y=2;
(2)原式=
1 |
2 |
1 |
2×3 |
1 |
3×4 |
1 |
4×5 |
1 |
2010×2011 |
=
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
2009 |
1 |
2010 |
1 |
2010 |
1 |
2011 |
2010 |
2011 |
1 |
xy |
1 |
(x+1)(y+1) |
1 |
(x+2)(y+2) |
1 |
(x+2009)(y+2009) |
1 |
2 |
1 |
2×3 |
1 |
3×4 |
1 |
4×5 |
1 |
2010×2011 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
2009 |
1 |
2010 |
1 |
2010 |
1 |
2011 |
2010 |
2011 |